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  • 线程的资源同步问题

    卖出的票为负数的情况:

    class MyThread22 implements Runnable {
        private int ticket = 10;

        public void run() {
            for (int i = 0; i < 100; i++) {
                if (ticket > 0) {
                    try {
                       Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println("Saling: ticket= " + ticket--);
                }
            }
        }
    }

    public class SyncDemo01 {
        public static void main(String[] args) {
            MyThread22 mt = new MyThread22();
            Thread t1 = new Thread(mt);
            Thread t2 = new Thread(mt);
            Thread t3 = new Thread(mt);
            t1.start();
            t2.start();
            t3.start();
        }
    }

    使用同步方法解决此问题:

    class MyThread30 implements Runnable {
        private int ticket = 20;

        public void run() {
            for (int i = 0; i < 100; i++) {
                this.sale();
            }
        }

        public synchronized void sale() {
            if (ticket > 0) {
                try {
                    Thread.sleep(300);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("saling: ticket=" + ticket--);
            }
        }
    }

    public class SyncDemo03 {
        public static void main(String[] args) {
            MyThread30 mt = new MyThread30();
            Thread t1 = new Thread(mt);
            Thread t2 = new Thread(mt);
            Thread t3 = new Thread(mt);
            t1.start();
            t2.start();
            t3.start();
        }
    }

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  • 原文地址:https://www.cnblogs.com/vonk/p/3895282.html
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